Question

If theta is an acute angle, solve sin3A =cos 2A.....please try to solve now it's really urgent!!!!

Answer 1

A=18°
Write cos2A as sin(90°-2A) . and cancell sin both sides... u will get that..
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Answer 2

we know that sin 90 minus theta equal to cos theta therefore it means if we suppose theta to be A sin 90- 2A = cos2A .......but plzz reply is question has sin Sin 3A